Phyllidiella rosans from Maldives

December 24, 1999
From: Eriwn Koehler

the Phyllidiids will get me crazy. After your message about Phyllidiella granulata I reviewed my Phyllidiella rudmani from the Maldives and had to accept, that most of them are Phyllidiella zeylanica. This will be changed
tonight. I don't know why, but the print (of Phyllidiella granulata) looks pretty different from the negative (there you can see clearly two "white" lines).

So far, so good - now to the new ones from the Maldives. I think they all are Phyllidiella rosans although some of them don't fit the descriptions. The colour of the ridges varies from pale blue, dark blue,
purple, pink to grey and their tubercle ridges vary as shown. Variations I've not seen are blue ridged ones with interrupted ridges (or however this is expressed). Usually they look somehow like EK105913.

•EK067110 Ellaidhoo Is., divesite "Cari Beyru Tila", Nov 21, 1996, size 15 mm, depth 9 m
•EK104614 Guraidhoo Is., divesite "Guraidho Kandu", Oct. 24, 1999, size 32 mm, depth 19 m
•EK105430 Kanifinolhu Is., divesite "Kani Corner", Oct. 27, 1999, 27 mm, depth 22 m
•EK105913 Lankanfinolhu Is., divesite "Nasimo Thila", Oct. 28, 1999, size 29 mm, depth 14 m
•EK106428 Meerufenfushi Is., divesite "Prisca Corner", Oct. 31, 1999, size 22 mm, depth 18 m
•EK106825 Gaafaru Is., divesite "Wreck of the Lady Christine", Nov. 01, 1999, size 34 mm, depth 6 m
•EK106903 Gaafaru Is., divesite "Iruwai Kandu", Nov. 01, 1999, size 12 mm, depth 20 m


Koehler, E., 1999 (Dec 24) Phyllidiella rosans from Maldives. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Erwin,
Yes I think these are all P. rosans. I can't say phyllidiids are my favourite group to identify but I think the large series of photos you are sending will help us to better understand the variation occurring within some of these species. In the case of Phyllidiella rosans your photos suggest that the ridges vary in colour from pink to green and bluish much like in Phyllidiella pustulosa.

Sorry I have been sitting on these photos for a while. I can now go on holiday with a clear conscience.

Best wishes for Xmas and the New Year,
Bill Rudman.

Rudman, W.B., 1999 (Dec 24). Comment on Phyllidiella rosans from Maldives by Eriwn Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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